52 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
by angular pale areas. Sides with smaller alternating dark blotches. 
Posteriorly the blotches become much smaller and are disposed in trans- 
verse series of three. Lower surfaces yellowish white, dotted, clouded 
or marbled with dark brown. : 
Ieen oth tO WaMu; Acta ueyeneerepeererae enero 543 mm. 
Length of tailiy .2 5.00. c tee ei uel 173 mm. 
A second specimen from Toroku, Formosa, caught in 
1905, is in the Sanitary Laboratorium, Formosa. A third 
specimen, received by the Academy, was collected at Mt. 
Arisan, Central Formosa. In coloration and form this serpent 
is, at first glance, strongly suggestive of Agkistrodon acutus, 
although on direct comparison they appear very dissimilar. 
Natrix copei new species 
Diagnosis —Maxillary teeth about 21, gradually increasing in size 
posteriorly, not followed by abruptly enlarged ones. Head distinct from 
neck. Eye rather large with round pupil; lateral. Internasal shields 
broadly truncate anteriorly. Anal divided. Scales in seventeen rows. 
Temporals 1-1 or 2-2. Seven supralabials; third and fourth entering the 
eye. Gastrosteges 125-128. Urosteges 76. 
Type.—California Academy of Sciences, No. 18004. Kanshirei, For- 
mosa, April, 1909. 
Description of the Type—Eye rather large; rostral once and a half as 
broad as deep, scarcely visible from above; internasals shorter than pre- 
frontals; frontal much longer than broad, longer than its distance from 
end of snout, shorter than parietals; loreal about as deep as long; one 
preocular; three postoculars; temporals 1-1; seven upper labials, third 
and fourth entering eye; four lower labials in contact with anterior geni- 
als; posterior genials much longer than anterior; scales in 17 rows, 
strongly keeled except first row where smooth or weakly keeled; gas- 
trosteges 123; urosteges divided; anal divided. 
Head nearly uniform brown; labials light with blackish edges. Upper 
surfaces of body and tail rather dark brown with a suggestion of a paler 
brown stripe on each side along the fourth, fifth and sixth scale-rows, 
and indications of small blackish spots medially and laterally. Outer 
row of scales lighter, clouded with slate. Belly yellow, with a more or 
less wedged-shaped blackish spot near the outer extremity of each gas- 
trostege and urostege forming a distinct series along each side of the 
belly and tail. 
Weneth to vantis me Aye see ere mle eereievele a teleicyele 320 mm. 
Wengthyoticatlioed). sels cee sehen tee. 54 mm. (broken) 
This is a most clearly defined species, since the very 
small number of gastrosteges occurs in no other Asiatic mem- 
